The Design And Optimization Of SMES Coils

Recently with the development of superconducting magnet technology, superconducting magnet is widely used in electrical region such as superconducting motor, superconducting transformer, superconducting cable, SFCL (superconducting fault current limiter), SMES (superconducting magnetic energy system) and so on. Comparing with the common magnet, the superconducting magnet is more economical and applied. And sometimes it is unique in the special condition. Because of its unique superiority, a lot of designing and fabricating work about it is developed all over the world. In this condition, the Superconducting Power Science and Technology R & D Center was born in Huazhong University of Science and Technology to do some research in superconducting power science, specially in the design of superconducting magnet. Subsequently, there will be a detailed description about the design of SMES magnet in this paper.Firstly, the electromagnetic theory and the FEA software ANSYS which are applied in the design of superconducting magnet are introduced. Then the author tells us the basic steps of magnet design which will offer some reference in the design.Secondly, by means of the Virial Theorem and Simulated Annealing Algorithm, the author finished a design on two different constructional SMES magnets including solenoid coil using YBCO and annular coil. After the calculation, the advantage and shortcoming of every construction are shown.Finally, the analysis of stray magnetic field of a 35kJ/7kW SMES coil both in theory and in experiment is finished. By the research of calculated result, the numerical design method is proved correctly, and new problem is offered.The traditional method of magnet design which just depends on basal electromagnetic theory is not only complicated but also not precise. The numerical calculation method using ANSYS and Simulated Annealing Algorithm which is introduced in this paper makes the design more quickly and reliably. Meanwhile the calculation is proved by the experimental result. In conclusion the numerical calculation method which is used in the design of SMES coil is more simple, precise and feasible.